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Senior Backend Engineer - Payments (Go, TypeScript, Node.js)

Remote from Spain·Full-time·Added yesterday

SPD Technology

11 open roles

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Overview

Job details

  • Full-time hours

    Per the ad.

  • Fully remote

    Only from certain places, per the ad: “4-6 hours of overlap with US Central Time is required”

Requirements

  • Have the right to work in Spain

    SPD Technology doesn't mention sponsorship in the ad.

  • Work in English

    English is required, per the ad.

  • Have 6+ years of experience

    Senior-level role.

Requirements

What we're looking for

  • 6+ years of professional software engineering experience.
  • At least 3 years of hands-on experience with payment systems or payment processing.
  • Strong backend engineering experience with Go, TypeScript, and Node.js.
  • Direct experience owning production payment flows rather than only performing basic payment API integrations.
  • Experience integrating payment processors, gateways, or acquirers such as Stripe, Adyen, Braintree, Checkout.com, Worldpay, Fiserv, or similar providers.
  • Strong understanding of the card payment lifecycle, including authorization, capture, settlement, refunds, chargebacks, and disputes.
  • Understanding of bank payment rails and preferably ACH/NACHA concepts, including returns and transaction timing.
  • Experience with payment reconciliation and settlement.
  • Strong understanding of webhooks, retries, idempotency, asynchronous processing, and distributed-system failure scenarios.
  • Experience designing relational data models for transaction-heavy systems.
  • Understanding of PCI DSS and payment-security patterns such as tokenization and isolation of sensitive payment data.
  • Strong attention to correctness and edge cases, especially in financial systems.
  • Fluency with modern AI-assisted development tooling.
  • Strong English communication skills and confidence working directly with a US-based team.
  • Ability to work with 4-6 hours of daily overlap with US Central Time.

Nice to have

  • Experience with platform, marketplace, or facilitator models (split payments, sub-merchant onboarding, multi-party flows).
  • Experience with payouts and disbursement rails, including bank-account collection, verification, and payout status handling.
  • Experience with fraud and risk tooling, and bank-account validation services.
  • Experience with e-commerce plugin or SDK development (WooCommerce, Shopify, Magento).
  • Knowledge of multi-currency, cross-border, or alternative payment methods.
  • Experience with event sourcing applied to financial state, and double-entry ledger design.

The role

As a Senior Backend Engineer you will join a product team building payment infrastructure for merchants and partner platforms. The platform enables businesses to accept payments, manage payouts, process card and bank transactions, and handle payment-related operations without relying on multiple disconnected providers.

The engineering challenges go far beyond basic payment integrations. The platform handles payment orchestration, transaction processing, settlement and reconciliation, payouts, fraud and KYC integrations, and complex failure scenarios across systems that the team does not fully control.

This role is a strong fit for an engineer who understands how money actually moves through payment systems and is comfortable owning critical backend flows end to end.

What you'll do

  • Own end-to-end payment flows in TypeScript/NestJS services: authorization, capture, void, refund, dispute handling, and payout initiation and confirmation.
  • Build and maintain acquirer and processor integrations, keeping the platform acquirer-agnostic behind clean internal abstractions.
  • Design embedded and hosted checkout experiences (hosted fields, iframes, tokenization) that keep sensitive cardholder and bank data out of internal systems and minimize PCI scope.
  • Implement fee calculation and rate logic, including tiers, interchange-plus, flat structures, rounding rules, special rates, and edge cases.
  • Build the reconciliation and settlement layer to match processor reports and settlement files against internal records and surface breaks.
  • Design event handling incorporating idempotency keys, out-of-order and duplicate webhooks, retries with backoff, and state machines.
  • Integrate fraud, bank-account verification, and KYC providers, tuning decisioning against real outcomes.
  • Handle ACH mechanics including submission windows, returns, return codes, NOCs, and retry rules.
  • Ensure correctness in the domain, maintaining complete audit trails and producing reconciliation evidence.
  • Act as the team's payments expert, advising product on rail capabilities and reviewing payment-adjacent code.

How you'll work

Full-time, remote. Daily collaboration with a US-based team (4-6 hours of overlap with US Central Time is required)

Tech Stack

Go, TypeScript, Node.js / NestJS, PostgreSQL, Event-driven backend services, Webhooks and asynchronous processing, Payment processor and acquirer integrations, Containerized cloud infrastructure, CI/CD

Hiring process

  1. Interview with Recruiter
  2. Technical Interview
  3. Client Interview.

About SPD Technology

SPD Technology is a global technology consultancy that designs, builds, and operates data platforms, AI solutions, and cloud infrastructure for enterprise clients. The company operates at a significant scale with a global footprint, delivering complex data engineering and machine learning projects across multiple industries.

In Spain, SPD Technology is actively hiring senior engineering and AI/ML talent to support its growing Iberian client base, with roles spanning solution architecture, data engineering, and ML operations. The company's culture is international and English-centric, making it a natural fit for international professionals looking to relocate to Spain, offering the opportunity to work on cutting-edge AI and data projects within a global delivery framework.

Founded
1993
Employees
500–1,000
Headquarters
London, UK
In Spain
Madrid
Website
spd.tech

Good to know if you are moving

  • The company is headquartered in London, UK, so international hires would be joining a global team with a UK-centric corporate structure.
  • The open roles in Spain are senior-level (Staff Architect, Senior Data Engineer, Engineering Manager), indicating a preference for experienced international talent.
  • The company's work is delivered in English, which removes a language barrier for non-Spanish-speaking international professionals.
  • The Spain-based roles focus on AI/ML and data engineering, which are high-demand skill areas that offer strong long-term career mobility.
  • As a consultancy, the company works on client projects, which can offer exposure to a variety of industries and tech stacks.

In their own words

About the company & team

At SPD Technology, we bring together a team of like-minded people who are driven by the desire to bring value through their work, united in their commitment to high performance and delivering custom, cutting-edge tech solutions that drive clients' growth. We empower our people with a culture of excellence, and enable them with the opportunity to uphold their accountability to contribute on each level. We value humanity and collaboration, encourage professional and personal growth, and foster a supportive and flexible work environment where everyone's contribution is welcomed.

We are looking for Senior Backend Engineer to join us as part of our team

Additional information

Join the team of experts who create custom, cutting-edge tech solutions for world-renowned businesses, fueling clients growth. Unleash your potential, tackle new challenges, and be part of a team that values your skills and contributions. Focus on long-term impact and building tailored, long-lasting partnerships with our clients.

Work fully remote around the globe, or in a hybrid work model from our office hubs which are equipped with everything needed for comfortable work. Enjoy a flexible working schedule and create work and rest balance for yourself. Empower yourself with a stable workload and a stable income, focusing on lasting cooperation and high-performance culture.

Take advantage of performance review and career path. Elevate your skills with mentorship program, personal development plan, and individual learnings through the corporate library, public speaking support, and more.

Be among like-minded people and feel supported with collaboration, open communication and mutual respect. Join company-wide tech and cultural events, and contribute to meaningful CSR initiatives that resonate with your values.

All open roles at SPD Technology

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